Helmet mounting kit match with 3w / 7w flashlight.
Diameter 22 mm (0.9 inches)
Easy to attach,  Quick to release and mount tightenly to the  Helmet which has open hole as shown in pic 1.1 and pci 1.2
Made of duty black plastic. The weight is just 5 oz
Helmet mounting kit match with all Nightpro Bike light
Easy to attach,  Quick to release and mount tightenly to the  Helmet which has open hole
Made of heavy duty black plastic. The weight is just 10 oz
Also, can fit with Trailtech HID DIY Kit .  ( Please take out post from TT HID, then fix the HID sandle  to Slide by screw )
It can be used for any DIY light project